i Register
In some senses, sis is marked as informal, British. Watch for register when choosing this word.
sis
UK /sɪs/ US /sɪs/
noun 6name 2
Definitions
name
1
Initialism of Secret Intelligence Service.
2
Initialism of Schengen Information System.
noun
1
Initialism of second impact syndrome.
2
Initialism of snow immersion suffocation.
3
Initialism of student information system.
4
Initialism of supervised injection site.
5
Acronym of share-in-savings.
noun
1
Clipping of sister.
big sis
My sis is tying the knot. I want you to play for the reception.
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